/Engine/Source/Runtime/Slate/Public/Framework/Text/TextLayout.h
bool InsertAt ( const [FTextLocation](API\Runtime\Slate\Framework\Text\FTextLocation) & Location, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IRun](API\Runtime\Slate\Framework\Text\IRun) > InRun, const bool bAlwaysKeepRightRun )